This is not quite true.
Even disregarding that I am unsure how much the hag witches could actually contribute in an university setting, like explained in an earlier post, would we be talking about any place in the Empire, I would be inclined to agree with you, but with Kislev, not so much. They are very isolationist, do notice that just giving access to a trading company in good standing needs a royal boon.
And we do want access to them - not only do they have Waystones nobody had studied or even described, alone their geographic position near the Chaos makes them the ideal location for our experiments and stone placements.
Consider how interested Boris was in the ability, then consider that if we get both Hag and Ice witches working on the framework then we would go to negotiate with both of their main magical traditions giving the idea a thumbs up.
Finally, even if for some weird reason they still say no. There are a huge amount of other areas we could do prototyping in, after which we could come back with an even more desirable product.
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